In which type of cancer is Alpha-fetoprotein $(AFP)$ produced?

Which is the most feared property of a malignant tumor?

Identify the odd one from the following:

When a proto-oncogene is transformed into a cancer-causing gene by some factor,it is called .......?

Study the following sentences.
$I.$ The cells of malignant tumours divide erratically.
$II.$ They are malignant tumours of epithelial cells.
$III.$ They are malignant tumours of organs that originate from mesoderm.
$IV.$ These tumours are found in organs such as spleen and lymph nodes.
Which of the above are true for angiosarcoma?

Which one of the following techniques is the safest for the detection of cancers?